Treatment	Control	Coefficient	Std. Err.	R-square
Hong Kong	Singapore	0.986***	0.060	0.9637
Macao	Singapore	1.035***	0.162	0.9844
Macao	Germany	0.646***	0.117	0.9844
Guangzhou	Jieyang	−0.700***	0.161	0.9921
Guangzhou	Yangjiang	1.523***	0.093	0.9921
Shenzhen	Jieyang	−0.627***	0.156	0.9902
Shenzhen	Yangjiang	1.322***	0.089	0.9902
Zhuhai	Shanwei	−0.526***	0.118	0.9983
	Shaoguang	0.933***	0.121
	Chaozhou	0.462***	0.136
Foshan	Yangjiang	0.914***	0.259	0.9995
	Shanwei	−1.279***	0.098
	Shaoguang	0.692**	0.228
	Chaozhou	0.788***	0.150
Huizhou	Shaoguan	0.470***	0.078	0.9983
Huizhou	Maoming	0.408***	0.087	0.9983
Dongguan	Shanwei	−1.488***	0.273	0.9963
	Shaoguang	2.413***	0.330
	Maoming	1.167***	0.240
	Qingyuan	−0.746***	0.134
Zhongshan	Jieyang	−1.019***	0.182	0.9937
Zhongshan	Zhanjiang	2.117***	0.121	0.9937
Jiangmen	Yangjiang	0.325***	0.027	0.9995
Jiangmen	Qingyuan	0.382***	0.033	0.9995
Zhaoqing	Jieyang	0.405***	0.094	0.9954
Zhaoqing	Yangjiang	0.657***	0.054	0.9954